UE4.15 keeps crashing At Startup

this is the error i get :
Fatal error: [File:D:\Build++UE4+Release-4.15+Compile\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp] [Line: 796]
Rendering thread exception:
Fatal error!

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000000

nvwgf2umx.dll!0x000000003F235658
nvwgf2umx.dll!0x000000003F15C14E
nvumdshimx.dll!0x00000000641855D3
d3d11.dll!0x00000000645A5DFE
dxgi.dll!0x00000000644AA898
dxgi.dll!0x000000006448D1B9
dxgi.dll!0x000000006446CB8F
dxgi.dll!0x000000006446CE69
UE4Editor-D3D11RHI.dll!FD3D11Viewport::PresentChecked() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\windows\d3d11rhi\private\d3d11viewport.cpp:281]
UE4Editor-D3D11RHI.dll!FD3D11Viewport::Present() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\windows\d3d11rhi\private\d3d11viewport.cpp:472]
UE4Editor-D3D11RHI.dll!FD3D11DynamicRHI::RHIEndDrawingViewport() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\windows\d3d11rhi\private\d3d11viewport.cpp:591]
UE4Editor-RHI.dll!FRHICommandList::EndDrawingViewport() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\rhi\private\rhicommandlist.cpp:1360]
UE4Editor-SlateRHIRenderer.dll!FSlateRHIRenderer::DrawWindow_RenderThread() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\slaterhirenderer\private\slaterhirenderer.cpp:847]
UE4Editor-SlateRHIRenderer.dll!TGraphTask<FSlateRHIRenderer::DrawWindows_Private'::35’::EURCMacro_SlateDrawWindowsCommand>::ExecuteTask() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\core\public\async\taskgraphinterfaces.h:883]
UE4Editor-Core.dll!FNamedTaskThread::ProcessTasksNamedThread() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:954]
UE4Editor-Core.dll!FNamedTaskThread::ProcessTasksUntilQuit() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:701]
UE4Editor-RenderCore.dll!RenderingThreadMain() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\rendercore\private\renderingthread.cpp:325]
UE4Editor-RenderCore.dll!FRenderingThread::Run() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\rendercore\private\renderingthread.cpp:459]
UE4Editor-Core.dll!FRunnableThreadWin::Run() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:76]
UE4Editor-Core.dll!FRunnableThreadWin::GuardedRun() [d:\build++ue4+release-4.15+compile\sync\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:33]
KERNEL32.DLL!0x00000000698413D2
ntdll.dll!0x0000000069DE54E4
ntdll.dll!0x0000000069DE54E4


i want fix this it’s anonying me a lot i need help and thanks ^^

Guys I Fixed My Problem i updated my gpu then i made shure The Editor was using gpu in nvidia control pannel